AWS Lambda, Python : Call Shell script from Lambda or Linux command

Question

I am working on an AWS Lambda script written in Python where I am currently getting all the instances with specific tags, and removing the oldest one from them. After that, from the remaining instances, I would like to call a linux command on the instances. The only thing I require is to call crontab -r , as the oldest instance will have the cron set, and adding those crons in the ASG generated instances will cause duplicate emails being sent.

I am done till the part of getting all the instances except the oldest one, but how can I call crontab -r on each of those instances? Any ideas. Thank you.

Code :

import boto.ec2
import boto3
conn=boto.ec2.connect_to_region("eu-central-1")
reservations = conn.get_all_instances()
instances_list = []
process_instance_list = []
for res in reservations:
    for inst in res.instances:
        if 'Name' in inst.tags:
            if inst.tags['Name'] == 'PROJECT_NAME' :
               instances_list.append(inst);


instances_list.sort(key=lambda x: x.launch_time, reverse=False)
non_processed_id=instances_list[0]

for val in instances_list:
    if val.id != non_processed_id.id:
       // Call crontab -r here.

Thank you. :-)

stackoverflow.com/questions/44143310/…

error404
– error404

2019-06-28 15:31:04 +00:00
Commented Jun 28, 2019 at 15:31 — error404
– error404, Commented Jun 28, 2019 at 15:31
Ideally use EC2 Run Command via boto3. Or use Paramiko.

jarmod
– jarmod

2019-06-28 16:51:31 +00:00
Commented Jun 28, 2019 at 16:51 — jarmod
– jarmod, Commented Jun 28, 2019 at 16:51

Yann · Accepted Answer · 2019-06-28 19:40:40Z

3

Use boto3 send_command to execute a command on ec2.

Example for your case:

boto3.client('ssm').send_command(
    InstanceIds=[val.id], 
    DocumentName='AWS-RunShellScript', 
    Parameters={'commands': ['crontab -r']}, 
    Comment='Crontab remove'
)

edited Jun 28, 2019 at 19:40

answered Jun 28, 2019 at 19:08

Yann

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